Analysis of information sources in references of the Wikipedia article "Lunar orbit" in English language version.
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The moon's Hill sphere has a radius of 60,000 kilometres, about one-sixth of the distance between it and Earth.For mean distance and mass data for the bodies (for verification of the foregoing citation), see Williams, David R. (20 December 2021). "Moon Fact Sheet". NASA.gov. Greenbelt, MD: NASA Goddard Space Flight Center. Retrieved 23 July 2023.
Lunar mascons make most low lunar orbits unstable ... As a satellite passes 50 or 60 miles overhead, the mascons pull it forward, back, left, right, or down, the exact direction and magnitude of the tugging depends on the satellite's trajectory. Absent any periodic boosts from onboard rockets to correct the orbit, most satellites released into low lunar orbits (under about 60 miles or 100 km) will eventually crash into the Moon. ... [There are] a number of 'frozen orbits' where a spacecraft can stay in a low lunar orbit indefinitely. They occur at four inclinations: 27°, 50°, 76°, and 86° — the last one being nearly over the lunar poles. The orbit of the relatively long-lived Apollo 15 subsatellite PFS-1 had an inclination of 28°, which turned out to be close to the inclination of one of the frozen orbits—but poor PFS-2 was cursed with an inclination of only 11°.
The moon's Hill sphere has a radius of 60,000 kilometres, about one-sixth of the distance between it and Earth.For mean distance and mass data for the bodies (for verification of the foregoing citation), see Williams, David R. (20 December 2021). "Moon Fact Sheet". NASA.gov. Greenbelt, MD: NASA Goddard Space Flight Center. Retrieved 23 July 2023.
Lunar mascons make most low lunar orbits unstable ... As a satellite passes 50 or 60 miles overhead, the mascons pull it forward, back, left, right, or down, the exact direction and magnitude of the tugging depends on the satellite's trajectory. Absent any periodic boosts from onboard rockets to correct the orbit, most satellites released into low lunar orbits (under about 60 miles or 100 km) will eventually crash into the Moon. ... [There are] a number of 'frozen orbits' where a spacecraft can stay in a low lunar orbit indefinitely. They occur at four inclinations: 27°, 50°, 76°, and 86° — the last one being nearly over the lunar poles. The orbit of the relatively long-lived Apollo 15 subsatellite PFS-1 had an inclination of 28°, which turned out to be close to the inclination of one of the frozen orbits—but poor PFS-2 was cursed with an inclination of only 11°.
